To Get

Having

Rule

Formula

Diametral Pitch

Outer diameter and number of teeth

Divide number of teeth plus 1 by the outer diameter

Pd=N+1/Do

Pitch diameter

Outer diameter and number of teeth

Divide the product of outer diameter and number of teeth by number of teeth plus 1

D=N•Do/N+1

Outer diameter

Diametral pitch and number of teeth

Divide the number of teeth plus 1 by the quotient of number of teeth divided by pitch diameter

Do=N+1/(N/d)

Diametral pitch

Internal diameter and number of teeth

Divide number of teeth minus 1 by the internal diameter

Pd=N-1/D

Internal diameter

Diametral pitch and number

Divide number of teeth minus 1 by

Di=N-1/Pd